1、后缀上的区别
stay up late后面是加to do。
stay up面是加doing。
2、用法上的区别
stay up late用法是sb stay up late to do sth，表示某人熬夜为了做某事。
stay up 熬夜不睡，用法是stay up doing sth，表示正在熬夜做某事。
3、意思上的区别
stay up late：熬夜；睡得很晚。
stay up：熬夜不睡。
4、例句
①、stay up late
used to stay up late with my mom and watch movies.
我以前总是和妈妈一起熬夜看电影。
She could always sweet-talk Pamela into letting her stay up late
她总能哄得帕梅拉同意她晚睡一会。
②、stay up
I used to stay up late with my mom and watch movies.
我以前总是和妈妈一起熬夜看电影。
If necessary, the airship can stay up there for days to keep out of danger
必要时，飞艇能在那里停留数天以躲避危险。
